Get Native balance for address

curl --request GET \
  --url https://sandbox.oumla.com/api/v1/portfolio/native-balance \
  --header 'x-api-key: <api-key>' \
  --header 'x-sdk-version: <x-sdk-version>'

{
  "balance": [
    {
      "id": "<string>",
      "address": "<string>",
      "walletId": "<string>",
      "network": "<string>",
      "balance": "<string>",
      "createdAt": "<string>",
      "updatedAt": "<string>"
    }
  ],
  "pagination": {
    "totalElements": 100,
    "totalPages": 10,
    "skip": 0,
    "take": 10
  }
}